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\(y+y.\frac{1}{3}.\frac{9}{2}+y.\frac{7}{2}=25\)
\(y+y.6+y.\frac{7}{2}=25\)
\(y.\left(1+6+\frac{7}{2}\right)=25\)
\(y.\frac{21}{2}=25\)
\(y=25:\frac{21}{2}\)
\(y=25.\frac{2}{21}\)
\(y=\frac{50}{21}\)
\(y.5+y.3+y+y=50\)
\(y.\left(5+3+1+1\right)=50\)
\(y.10=50\)
\(y=5\)
\(y\times4,9+y\div10=1,2\)
\(y\times4,9+y\times\dfrac{1}{10}=1,2\)
\(y\times4,9+y\times0,1=1,2\)
\(y\times\left(4,9+0,1\right)=1,2\)
\(y\times5=1,2\)
\(y=1,2\div5\)
\(y=0,24\)
a, (85 + 15) x y = 4000 c,
100 x y = 4000
y = 4000 : 10
y = 40
b; 18 + y + y + y = 48 x 25
18 + (y + y + y) = 1200
18 + 3y = 1200
3y = 1200 - 18
3y = 1182
y = 1182 : 3
y = 394
( 16 + 25 - 1 ) x y = 1000
40 x y = 1000
y = 1000 : 40
y = 25
a)100-9:(372:3.y-1)-14=83
<=>100-9:(124y-1)-14=83
<=>86-9:(124y-1)=83
<=>9:(124y-1)=3
<=>124y-1=3
<=>124y=4
<=>y=\(\frac{1}{31}\approx0,3223\)
b)7260-120:24.y+924=528,3
<=>8184-5y=528,3
<=>5y=7655,7
<=>y=1531,14
c)2000-52:(615:3:y-15)-14=1984
<=>1986-52:(205:y-15)=1984
<=>52:(205:y-15)=2
<=>205:y-15=26
<=>205:y=41
<=>y=5
d)y+y.1/3+5/18=7/18
<=>4/3y=1/9
<=>y=1/12
e)13/15-(5/21+y)7/12=7/10
<=>7/12.(5/21+y)=1/6
<=>5/36+7/12y=1/6
<=>7/12y=1/36
<=>y=1/21\(\approx\)0,4762
h)y+2.y+3.y+...+10.y=49,5
<=>55y=49,5
<=>y=0,9
i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24
<=>7991,364899y=1/24
<=>y=33/6329161
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